yournamehere

I would wait until it's at its worst, then go downstairs and invite one or all of them to come up to your apartment. Once they're up there and can hear how bad it actually is, they may be more understanding and keep the volume down - after all - you said you've heard they're nice guys.

If not, I would talk to the people on either side of them - I'm sure they're suffering as much as you are. If all of you complain to the management - in writing - as a group - they'll probably get a "final" warning.

You have my sympathy - no one has the right to deprive another of a good night's sleep. I hope you resolve this quickly.

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If you want to avoid 95% of internet spelling errors:
"If your ridiculous pants are too loose, you're definitely going to lose them. Tell your two loser friends over there that they're going to lose theirs, too."
It won't hurt your fashion sense, either.